서지주요정보
Ti 미량합금강에서 탄질화물의 석출거동과 오스테나이트 결정립 성장거동에 미치는 탄소함량 변화와 Nb 복합첨가의 영향 = Influence of Nb addition and carbon content on the precipitation behavior of carbonitride and on the austenite grain growth in a Ti-microalloyed steel
서명 / 저자 Ti 미량합금강에서 탄질화물의 석출거동과 오스테나이트 결정립 성장거동에 미치는 탄소함량 변화와 Nb 복합첨가의 영향 = Influence of Nb addition and carbon content on the precipitation behavior of carbonitride and on the austenite grain growth in a Ti-microalloyed steel / 허태형.
발행사항 [대전 : 한국과학기술원, 1997].
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등록번호

8007483

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 97043

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초록정보

The effect of precipitation of carbonitride on austenite grain growth behavior in Ti-Nb microalloyed steel has been studied. Transmission electron microscopy and optical microscopy were used to investigate the morphology, particle size distribution, and precipitation kinetics of carbonitride, as well as the austenite grain growth behavior. In as-cast Ti-microalloyed steel slab, Ti-carbonitride particle size became coarser with increasing depth of slab because of slow cooling rate. Dendrite structure of low C slab B was finer than that of high C slab A. As-cast austenite grain size of slab B which has low C content is finer than that of slab A which has high C content. This is because of the fact that the Δ to γ transformation temperature of slab B is lower than that of slab A. So the austenite grain growth during casting was much restricted in low C slab B. This grain size difference was reflected in reheated condition. When Ti-microalloyed slab was reheated to a austenite region, carbonitride particle size became larger with increasing depth of slab and reheating temperature. There was no large difference in particle size distribution between low C slab B and high C slab A. But the particle size of slab A was larger than that of slab B at 1300℃ and the austenite GCT(Grain Coarsening Temperature) (i.e.,1300℃) in low C slab B was observed to be higher than that (i.e., 1250℃) in slab A. This is believed to be closely related to the difference of interdendritic segregation arising from a different fineness of dendritic structure. In an as-cast Ti-Nb microalloyed slab C, the particle size was larger than that in an as-cast Ti-microalloyed slab A and the coarse dendrite shaped particle, which was absent in slab A, was frequently observed. In slab C, carbonitride particles during reheating were coarser than those in slab A. But the austenite grain size and GCT of slab A and C is not much different. The coarsening rate of carbonitride in Ti-Nb microalloyed slab C was observed to be faster than that of Ti microalloyed slab A. This is belived to be due to the fact that solute solubility in slab C is higher than that in slab A. The Precipitation-Time-Temperature(PTT) curve has been determined using solution treated sample of Ti-Nb microalloyed slab C. The precipitation starting time was shortest at 1150℃ and the precipitation rate appeared to be accelerated as a result of Nb addition.

서지기타정보

서지기타정보
청구기호 {MMS 97043
형태사항 iii, 79 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Tae-Hyoung Huh
지도교수의 한글표기 : 박중근
지도교수의 영문표기 : Joong-Keun Park
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 78-79
주제 석출
결정립 성장
탄질화물
결정립 조대화 온도
Precipitation
Grain growth
Carbonitride
Grain coarsening temperature
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